Spatial mode control and advanced methods for multi-platform quantum communication

Quantum Communication, Quantum Optics, Adaptive Optics

Hill, Alexander D.

关键词: Quantum Communication, Quantum Optics, Adaptive Optics;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/102394/HILL-DISSERTATION-2018.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Though state-of-the-art quantum computers are currently limited to only a handful of physical qubits, a quantum computer large enough to perform prime factorization of modern cryptographic keys, quantum simulation, and quantum-enhanced searching algorithms will likely become viable within a few decades. Such computers demand communication networks that preserve the qualities of the quantum states used as inputs and outputs; they also herald the end of the flavors of classical cryptography reliant on the complexity of factoring large numbers. As a result, future networks must include channels which preserve the states of single photons over useful distances (e.g., using quantum repeaters), and must deploy quantum-safe cryptography to ensure the safety of classical information passing over the network.Here we discuss strategies affecting several areas of a future quantum-enabled network: first, we demonstrate a technique for adaptively coupling single photons from point sources into single-mode optical fiber and apply the technique to coupling from quantum dots (a popular candidate for a future quantum repeater); secondly, we discuss various methods for simulating the effects of atmospheric turbulence on quantum cryptographic protocols in the laboratory, critical for understand the challenges facing free-space implementations of quantum communication. Thirdly, we demonstrate a technique that enables quantum cryptographic networks over free space channels to function in the presence of strong atmospheric turbulence using a multi-aperture receiver. Finally, we discuss our efforts to miniaturize a quantum key distribution system and operate a key distribution channel between flying multirotor drones.